
/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                            i8259.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                                                    Forrest Yu, 2005
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

#include "type.h"
#include "stdio.h"
#include "const.h"
#include "protect.h"
#include "proc.h"
#include "fs.h"
#include "tty.h"
#include "console.h"
#include "global.h"
#include "proto.h"

/*======================================================================*
                            init_8259A
 *======================================================================*/
PUBLIC void init_8259A()
{
    out_byte(INT_M_CTL, 0x11);                /* Master 8259, ICW1. */
    out_byte(INT_S_CTL, 0x11);                /* Slave  8259, ICW1. */
    out_byte(INT_M_CTLMASK, INT_VECTOR_IRQ0); /* Master 8259, ICW2. 设置 '主8259' 的中断入口地址为 0x20. */
    out_byte(INT_S_CTLMASK, INT_VECTOR_IRQ8); /* Slave  8259, ICW2. 设置 '从8259' 的中断入口地址为 0x28. */
    out_byte(INT_M_CTLMASK, 0x4);             /* Master 8259, ICW3. IR2 对应 '从8259'. */
    out_byte(INT_S_CTLMASK, 0x2);             /* Slave  8259, ICW3. 对应 '主8259' 的 IR2. */
    out_byte(INT_M_CTLMASK, 0x1);             /* Master 8259, ICW4. */
    out_byte(INT_S_CTLMASK, 0x1);             /* Slave  8259, ICW4. */

    out_byte(INT_M_CTLMASK, 0xFF); /* Master 8259, OCW1. */
    out_byte(INT_S_CTLMASK, 0xFF); /* Slave  8259, OCW1. */

    int i;
    for (i = 0; i < NR_IRQ; i++)
    {
        irq_table[i] = spurious_irq;
    }
}

/*======================================================================*
                           spurious_irq
 *======================================================================*/
PUBLIC void spurious_irq(int irq)
{
    disp_str("spurious_irq: ");
    disp_int(irq);
    disp_str("\n");
}

/*======================================================================*
                           put_irq_handler
 *======================================================================*/
PUBLIC void put_irq_handler(int irq, irq_handler handler)
{
    disable_irq(irq);
    irq_table[irq] = handler;
}
